>>You can find solar azimuth tables on the web, with a fairly simple=20 calculation for finding the sun's >>position during the day at any site=20 on any date Joe Actually an 8-bit PIC can calculate the sun's position with a known=20 position and accurate time (such as WWV, WWVB or the NMEA output of any=20 GPS module). Do a Google search on "sun position" and you can obtain at=20 least two algorithms. --=20 The only place success comes before work is in the dictionary. VINCE LOMBARDI --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .